Description: Das Projekt "Thermische Behandlung von Farb- und Lackschlaemmen" wird vom Umweltbundesamt gefördert und von Sulzer durchgeführt. Metal hydroxide and paint sludge's are produced during pretreatment and paint spraying of metal surfaces and have to be considered as industrial waste due to the heavy metal content. Sulzer Chemtech is studying the pyro-processing of the sludge's in a pilot plant with an operational capacity of 20 to 100 kg/h. The purpose of this project is a save reintegration of the products in the ecosystem. The organic compounds are partial pyrolised in a fluidized bed at temperatures from 600 to 800 degree C. The inorganic compounds are vitrified subsequently in the temperature range of 1100 to 1400 degree C. By vitrification of metal hydroxide sludge in a very high reducing atmosphere, the glass can be depleted to a heavy metal concentration comparable to the crust of the earth. During melting, a heavy second phase is formed consisting of iron, copper nickel, chromium and tin alloys. Zinc and lead are almost completely evaporated. In the glass matrix, a phosphate and a silicate phase are coexisting. On the other hand, a low reducing atmosphere causes an incorporation of iron, lead and zinc into the glass structure. The evaporation of zinc and lead is low. Metal hydroxide and paint sludge's contain ecotoxic components like heavy metals and organic substances. They are classified as hazardous wastes and may not be disposed of by land filling anymore. Two different paths for immobilization and separation were investigated. Thermal treatment below melting temperature leads to an inert insoluble residue with minimal energy requirement. In an alternative process the sludge's are vitrified after a suitable pretreatment. A favorable choice of operating conditions allows a substantial separation of the heavy metals and the decomposition of the organic material. The high energy consumption, however, is only justified, when an upgrading of the products for further reuse is achieved. Separation of the heavy metals below melting temperature is the objective of a new project phase.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Recycling ? Schwermetallgehalt ? Naturwerkstoff ? Chrom ? Hydroxid ? Nickel ? Phosphat ? Phosphorsäureester ? Zinn ? Silikat ? Eisen ? Kupfer ? Anstrichmittel ? Arsen ? Metallhydroxid ? Zink ? Blei ? Schwermetall ? Industrie ? Anorganische Verbindung ? Verdunstung ? Wirbelschicht ? Industrieabfall ? Gefährlicher Abfall ? Organische Verbindung ? Energiebedarf ? Energieverbrauch ? Erdkruste ? Thermisches Verfahren ? Versuchsanlage ? Atmosphäre ? Ökosystem ? Legierung ? environmental technics ? problematic substances ? production process ? Waste(waters) ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1993-01-01 - 1995-12-31
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